no, we're talking about the Ansar-i Hezbollah, which is the main branch of the Iranian Hezbollah, which is to say the local color of religious fanatic. They've teamed up with the Basij (essentially the brownshirts) to put the hurt on the protesters at the behest of the government.
At any rate, despite some general religious similarities and obvious political expediency, Persians traditionally loathe Arabs. For the clerics to call on Arabs to suppress Persian dissent sends a message that they are willing to sell out their own people to maintain power, which is never a good message to send when you've destroyed their economy and use a threat of nuclear aggression against the rest of the world as a nationalistic rallying cry.
What's interesting is that as early as Sunday the actual riot police were seriously backing off the protesters and now it seems like a good number of them are actually marching with the Greens. Similarly (and this is the money shot, folks), there have been reports of uniformed Iranian soldiers protecting protesters from the Basij. There's no confirmation that the Revolutionary Guard (or even just a few regiments) have thrown in their lot with the Greens or if these are just a few isolated troops defying orders, but seriously: almost without exception in history, uprisings become revolutions when they gain the support of the military.
EDIT: I am reading back over this thread and I want to back up Arc on this one: this is not about the Presidency and it is entirely possible that Ahmadinejad won, just like it is possible that Bush really won in 2000. The point is we will never really know, regardless of who wins this struggle, because Khamenei falsified the results in a way that was so insultingly obvious that it calls in to question the legitimacy of Iran's "secular" bureaucracy.
The people are not necessarily revolting against the Islamic Republic, any more than 2000 means we want to abolish the Supreme Court. But the urban population of Iran is highly educated and acutely aware of what sort of democratic reforms their country needs, and what they as a country would stand to gain as a result. At the end of this, even if Khamenei holds on to power, he will have to cede a lot of it to the secular government, and then reform is going to start.